Weighted Value Calculation Framework

Hi,

I have a table with field 'priority'. 'Priority' depends on multiple other field values that from the table's related list records or record type field's value under same record. 

Planning to give those fields arithmetic values then bringing a score rank system to calculate & assign the final value to ''priority''.

Are there any framework that available for this weighted calculation? 

The Matching rule kinda works but the ranking method is using 'More is better'/ 'Less is better.' and got me confused. Hard to find any helpful tutorial online too.

Of course BR would help too but that would involve heavy implementing.

Anyone has better advice or recommended framework? 

Appreciate your help!

Many thanks!